Spin-1 Weyl point and surface arc state in a chiral phononic crystal
Spin-1 Weyl point and surface arc state in a chiral phononic crystal
Spin-1 Weyl point is formed by three bands touching at a single point in the three dimensional (3D) momentum space, with two of which show cone-like dispersion while the third band is flat. Such a triply degenerate point carries higher topological charge $\pm2$2 and can be described by a three-band …